<template>
<div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar class="page-nav-bar" left-arrow title="黑马头条"></van-nav-bar>
    <!-- /导航栏 -->

    <div class="main-wrap">
      <!-- 加载中 -->
      <div v-if="loading" class="loading-wrap">
        <van-loading color="#3296fa" vertical >加载中</van-loading>
      </div>
      <!-- /加载中 -->

      <!-- 加载完成-文章详情 -->
      <div class="article-detail" v-else-if="article.aut_name">
        <!-- 文章标题 -->
        <h1 class="article-title">{{article.title}}</h1>
        <!-- /文章标题 -->

        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image  class="avatar" slot="icon" round   fit="cover"   :src="article.aut_photo" />
          <div slot="title" class="user-name">{{article.aut_name}}</div>
          <div slot="label" class="publish-date">{{article.pubdate | formatDate}}</div>

          <!-- <FollowUser :isFollow="article.is_followed" :autID="article.aut_id"></FollowUser> -->
          <FollowUser v-model="article.is_followed" :autID="article.aut_id"></FollowUser>
          <!-- 如果父组件要传值给子组件 且子组件也要修改值  , name就可以使用v-model进行数据绑定 -->
          <!-- v-model="article.is_followed"
          浏览器会解析为 :value="article.is_followed" @input="article.is_followed = $event"
          如果想进行自定义  可以在子组件内配置model
          model: {
            prop: 'isFollow',
            event: 'updateisFollow'
          },-->
        </van-cell>
        <!-- /用户信息 -->

        <!-- 文章内容 -->
        <div class="article-content markdown-body" ref="content" v-html="article.content"></div>
        <van-divider>正文结束</van-divider>
        <!-- 评论列表 -->
            <!-- 由于回复按钮是在孙子组件中, 所以要通过孙子触发儿子儿子再触发我的事件 来显示控制弹层 -->
        <CommentList @clickReply='ReplyFn' :list='list' :source="article.art_id" @updateTotal ='totalCount = $event'></CommentList>
        <!-- <CommentList type="c"></CommentList> -->
      </div>
      <!-- /加载完成-文章详情 -->

      <!-- 加载失败：404 -->
      <div class="error-wrap" v-else-if="is404">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>
      <!-- /加载失败：404 -->

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div class="error-wrap" v-else>
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button class="retry-btn" @click="getArticleDetailsFn">点击重试</van-button>
      </div>
      <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
    </div>

    <!-- 底部区域 -->
    <div v-if="article.aut_id" class="article-bottom">
      <van-button
        class="comment-btn"
        type="default"
        round
        size="small"
        @click="isshowPopup = true"
      >写评论</van-button>
      <van-icon
        name="comment-o"
        :badge="totalCount"
        color="#777"
      />
     <Star v-model="article.is_collected" :artId="article.art_id"></Star>
      <van-icon
        color="#777"
        name="good-job-o"
      />
      <van-icon name="share" color="#777777"></van-icon>
    </div>
    <!-- /底部区域 -->
    <!-- 弹出层 -->
    <van-popup v-model="isshowPopup" position="bottom"  >
      <!-- 对文章进行评论时,需要传文章id -->
      <!-- 对评论进行评论时,需要传文章id和评论id -->
      <CommentPost :list='list' :target='articleId' @onPostComment ='onPostComment'></CommentPost>
    </van-popup>
    <!-- 点击回复 显示回复的弹层 -->
    <van-popup v-model="isShowReplyPopup" position="bottom"  style="height: 100%">
      <CommentReply v-if="isShowReplyPopup" @close-reply='isShowReplyPopup=false' :row='ComponnetItem'></CommentReply>
    </van-popup>
  </div>
</template>

<script>
import { getArticleDetailsAPI } from '@/api/article.js'
import { ImagePreview } from 'vant'
import './github-markdown.css'
import FollowUser from '@/components/followUser.vue'
import Star from '@/components/star.vue'
import CommentList from './components/commentList.vue'
import CommentPost from '@/components/CommentPost.vue'
import CommentReply from './components/commentReply.vue'
export default {
  // props可以接受父组件传递的数据
  // props也可以通过一个变量接收路由携带的参数  只需要在跳转到本组件的路由规则上 设置props=true即可
  props: {
    articleId: {
      type: String,
      required: true
    }
  },
  data () {
    return {
      article: '',
      loading: true,
      is404: false,
      totalCount: '', // 评论条数
      isshowPopup: false, // 弹出层的显示隐藏
      list: [],
      isShowReplyPopup: false, // 回复显示的弹层
      ComponnetItem: {}
    }
  },
  components: {
    FollowUser,
    Star,
    CommentList,
    CommentPost,
    CommentReply
  },
  created () {
    this.getArticleDetailsFn()
  },
  methods: {
    // 获取文章详情
    async getArticleDetailsFn () {
      this.loading = true
      try {
        const res = await getArticleDetailsAPI(this.articleId)
        this.article = res
        this.loading = false // 修改loading 会引起视图更新 视图更新时异步任务
        this.$nextTick(() => {
          // console.log(this.$refs.content)
          const contentNode = this.$refs.content
          const imgs = contentNode.querySelectorAll('img')
          const arr = []
          imgs.forEach((item, index) => {
            arr.push(item.src)
            item.onclick = () => {
              ImagePreview({
                images: arr,
                startPosition: index

              })
              console.log(item.src)
            }
          })
        })
      } catch (error) {
        if (error.response && error.response.status === 404) {
          this.loading = false
          this.is404 = true
        }
      }
    },
    // 子组件点击发布时触发
    onPostComment (obj) {
      this.isshowPopup = false
      this.list.unshift(obj)
    },
    // 孙子组件点击回复时触发
    ReplyFn (row) {
      this.isShowReplyPopup = true
      this.ComponnetItem = row
      console.log(row)
    }

  }
}
</script>

<style scoped lang="less">
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>
